Add zombie apocalypse spell

src/main/java/electroblob/wizardry/spell/SpellMinion.java

@@ -52,7 +52,7 @@ public class SpellMinion<T extends EntityLiving & ISummonedCreature> extends Spe
 	 * entity attribute modifier. */
 	public static final String HEALTH_MODIFIER = "minion_health";
 	/** The string identifier for the potency attribute modifier. */
-	private static final String POTENCY_ATTRIBUTE_MODIFIER = "potency";
+	public static final String POTENCY_ATTRIBUTE_MODIFIER = "potency";
 	
 	/** A factory that creates summoned creature entities. */
 	protected final Function<World, T> minionFactory;

src/main/java/electroblob/wizardry/spell/ZombieApocalypse.java

@@ -0,0 +1,27 @@
+package electroblob.wizardry.spell;
+
+import electroblob.wizardry.entity.construct.EntityZombieSpawner;
+import electroblob.wizardry.item.SpellActions;
+import electroblob.wizardry.util.SpellModifiers;
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.util.EnumFacing;
+import net.minecraft.world.World;
+
+import javax.annotation.Nullable;
+
+public class ZombieApocalypse extends SpellConstruct<EntityZombieSpawner> {
+
+	public static final String MINION_SPAWN_INTERVAL = "minion_spawn_interval";
+
+	public ZombieApocalypse(){
+		super("zombie_apocalypse", SpellActions.POINT_UP, EntityZombieSpawner::new, false);
+		addProperties(SpellMinion.MINION_LIFETIME, MINION_SPAWN_INTERVAL);
+	}
+
+	@Override
+	protected boolean spawnConstruct(World world, double x, double y, double z, EnumFacing side, @Nullable EntityLivingBase caster, SpellModifiers modifiers){
+		y += 8;
+		return super.spawnConstruct(world, x, y, z, side, caster, modifiers);
+	}
+
+}